Chelsea's Champions League hopes suffered a major setback as Jose Mourinho's return to Porto ended in a woeful defeat.

Goals from Andre Andre and Maicon in each half were enough to secure the three points for the Portuguese giants despite Willian's brilliant equaliser from a free kick.

Chelsea will now be under huge pressure going to Dynamo Kiev, who now lead them and Porto in Group G by a point, in three weeks' time.

Chelsea were made to pay for woeful errors at the back, with Branislav Ivanovic once again at fault Changes to the starting line-up had been expected after Mourinho was very critical of his players in the build-up to the match.

A look at the team-sheet showed that Nemanja Matic and Eden Hazard were two of the players punished for the anaemic display at Newcastle as they were dropped to the bench.

More significantly was the news that Oscar, Loic Remy and Radamel Falcao hadn't even travelled and it wasn't because they had suffered an injury.

Porto vs Chelsea: Player Ratings

Porto vs Chelsea: Player Ratings

1/11
Asmir Begovic: 7

One of Chelsea’s best players on the pitch. The goalkeeper made several saves to deny the likes of Aboubakar and Brahimi throughout the game and, despite his one-handed stop to keep out Brahimi’s first-half effort, he could do nothing to stop Andre opening the scoring.

2/11
Branislav Ivanovic: 4

After failing to clear an early Porto effort, the full-back – acting as captain in John Terry’s absence – allowed Brahimi to dribble past him all too easily seconds before the opener. Although he made a vital block to deny the Porto midfielder in the second half, Ivanovic should have equalised but headed Willian’s corner wide. Another under-par performance from the right-back.

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3/11
Kurt Zouma: 5

Failed to put in the strong and dominating displays he has shown in the past and looked uncomfortable as he and Cahill were too often run past by Aboubakar and Brahimi. Communication between the pair is appearing to be an issue.

4/11
Gary Cahill: 4

Failed to shepherd his back line well enough during the set piece that Maicon made it 2-1 from, and should have done better to mark the Porto defender. Was often dragged out of position and didn’t show the leadership skills that were sorely needed to control the likes of Aboubakar.

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5/11
Cesar Azpilicueta: 6

Defended well overall and literally put his body on the line to keep out an early shot, but did not see Andre advancing for the opener. Was then shown a yellow card for pulling the Porto winger back and began to lose the battle to control him in the second half.

6/11
John Obi Mikel: 5

Looked good in the early stages of the game, but failed to really control Brahimi in the middle of the park, which led to the Porto man running riot and being involved in the opening goal. Was replaced by Hazard in the second half.

7/11
Cesc Fabregas: 5

Tested Casillas with a long-range shot in the sixth minute that proved to be one of Chelsea’s best chances early on, but the Spaniard failed to once again impress when needed to create attacks.

8/11
Ramires: 5

Was deployed on the right and his inclusion in the starting XI paid off when the Brazilian won the free-kick that Willian scored from. However, he was later out-muscled by Maicon, which allowed the Porto captain to seal the win. Was taken off in the 70th minute for Hazard.

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9/11
Willian: 8

Worked hard in midfield and, on more than one occasion, the Brazilian tracked back to help defend. He capped off a good display with a brilliant free-kick that restored parity for the visitors.

10/11
Pedro: 5

Mourinho started the Spain international on the left after utilising him on the right following his summer move to the club and, aside from his powerful shot that Casillas saved in the 13th minute, Pedro disappointed. He failed to provide the service that Costa desperately needed and was taken off in the second half.

11/11
Diego Costa: 6

Despite missing Chelsea’s last two games, the striker was lively and got past Maxi Pereira time and time again in the first period. He was unlucky not to have scored when his powerful curling shot hit the bar in the second half, but the main issue for Costa was that he was left isolated too often – which forced him to drop deep to find the ball. He also should have been awarded a penalty when his shot ricocheted off Marcano’s arm in the area with minutes of the game left.

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Bizarrely though Ivanovic, arguably Chelsea's worst performer since the start of the season, kept his place at right back and was captain due to John Terry being named on the bench once more.

Mourinho's decision proved costly as Yacine Brahimi beat the Serbia international with ease all night, including for the opening goal when his shot was saved by Asmir Begovic only for Andre to net on the rebound.

Chelsea had actually looked better in attack and former Real Madrid keeper Iker Casillas, making a record 152nd appearance in the Champions League, made smart saves early on from Cesc Fabregas and Pedro.

But there was nothing he could do in the second minute of first half injury time when Willian curled a free kick from just outside the box into the top corner.

Chelsea's joy didn't last long though as more sloppy marking from Ivanovic led to a Porto corner. From the resulting kick, Maicon got ahead of Ramires at the near post to head a soft winner.

Diego Costa came closest to an equaliser when his superb shot hit the crossbar while a last second Kenedy strike deflected wide.

But Porto had enough chances to win by a greater margin and Mourinho must wonder where Chelsea go from here.